2-alkanoyl or benzoyl-3-tertiaryamino alkoxy-benzothiophenes

ABSTRACT

BENZOTHIOPHENE DERIVATIVES HAVING THE STRUCTURAL FORMULA DESCRIBED BELOW, A METHOD FOR THEIR PREPARATION AND PHARMACEUTICAL PREPARATIONS CONTAINING THEM. THESE PREPARATIONS ARE USEFUL AS ANALGESIC, ANTIPYRETIC, ANTIINFLAMMATORY ANTITUSSIVE AGENTS, AS LOCAL ANAESTHETICS AND ANTISPASMODIC AND ANTIHISTAMINIC AGENTS. THEY HAVE THESE PROPERTIES COMBINED WITH RELATIVELY LOW TOXICITY. THEY MAY THEREFORE, BE USED FOR THE RELIEF OF PAIN, INFLAMMATION, PYRESIS OF VARIOUS ORIGINS, OR TUSSIVE IRRITATION.

US. Cl. 260247.1 8 Claims ABSTRACT OF THE DISCLOSURE Benzothiophene derivatives having the structural formula described below, a method for their preparation and pharmaceutical, preparations containing them. These preparations are useful as analgesic, antipyretic, antiinfiammatory antitussive agents, as local anaesthetics and antispasmodic and antihistaminic agents. They have these properties combined with relatively low toxicity. They may therefore, be used for the relief of pain, inflammation, pyresis of various origins, or tussive irritation.

This is a continuation-in-part of application Ser. No. 553,616, filed May 31., 1966, now abandoned.

The present invention relates to benzothiophene derivatives and is concerned with a new class of compounds havingvaluable pharmacological properties, their production and pharmaceutical preparations containing them.

In one aspect, the invention comprises benzothiophene derivatives represented by the general formula:

(wherein R represents a lower alkyl group or an unsubstituted or substituted phenyl group in which any substituent is a lower alkyl, lower alkoxy, dioxy-lower alkylene or trifluoromethyl group or a fluorine, chlorine or bromine atom, R represents a hydrogen, fluorine, chlorine or bromine atom or a lower alkyl or lower alkoxy group, R

represents a hydrogen, fluorine, chlorine or bromine atom or a lower alkyl or lower alkoxy group or, provided R is a hydrogen atom, a nitro, amino, hydroxy, lower acyloxy, lower dialkylamino or lower acylamino group, A represents 'an alkylene group containing not more than four carbon atoms, R represents a hydrogen atom or a lower alkyl group, R represents a lower alkyl or benzyl group, or

represents a pyrrolidino, piperidino, hexamehyleneimino, morpholino, lower dialkylmorpholino, piperazino, lower alkylpiperazino, N-benzylpiperazinoor tetrahydropyridino group) in the form of the free base or of a pharmaceutically acceptable salt thereof.

3,558,616 Patented Jan. 26, 1971 ethoxyphenyl, p ethoxyphenyl, 3,4 methylenedioxyphenyl, p-n-propoxyphenyl, p-iso-propoxyphenyl, p-nbutoxyphenyl, o chlorophenyl, m chlorophenyl, pchlorophenyl, o-bromophenyl, m-bromophenyl, p-bromophenyl, o-fluorophenyl, m-fluorophenyl, p-fluorophenyl, o-trifluoromethylphenyl, m-trifluoromethylphenyl or p-trifiuoromethylphenyl;

R and R hydrogen, methyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl, n-amyl, methoxy, ethoxy, n-propoxy, iso-propoxy, n-butoxy, fluorine, chlorine, bromine, and when R is hydrogen, R may additionally represent nitro, amino, hydroxy, acetoxy, propionoxy, dimethylamino, diethylamino, di-n-propylamino, formylamino, acetylamino, propionylamino, butyrylamino or isobutyrylamino;

R hydrogen, methyl, ethyl, n-propyl, iso-propyl, n-butyl,

iso-butyl or n-amyl;

R methyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl,

n-amyl or benzyl;

NR R pyrrolidino, piperidino, hexamethylene-imino,

morpholino, 2,6-dimethylmorpholino, piperazino, N- methylpiperazino, N-ethylpiperazino, N-benzylpiperazino 0r tetrahydropyridino.

Benzothiophene derivatives according to the invention have been shown to possess valuable pharmacological properties, more particularly antitussive properties and may contain one or more of the properties analgesic, anti pyretic, antiinflammatory, local anaesthetic, antispasrnodie and antihistaminic activity, in each case combined with relatively low toxicity. They may, therefore be used for the relief of tussive irritation and one or more of the symptoms, pain, inflammation, and pyresis of various origins.

In clinical practice the benzothiophene derivatives of the invention will normally be administered orally, rectally or by injection in the form of pharmaceutical preparations comprising the active ingredient in the form of the free base or one of the common pharmaceutically acceptable salts, e.g. the hydrochloride, in association with a pharmaceutically acceptable carrier which may be a solid, semi-solid or liquid diluent or an ingestible capsule and such preparations comprise a further aspect of the invention. Usually the active substance will comprise between 0.1 and by weight of the preparation, for example, between 0.5 and 20% for preparations intended for injection and between 0.1 and 50% for preparations intended for oral administration.

To produce pharmaceutical preparations in the form of dosage units for oral application containing a compound of the invention in the form of the free base, or a pharmaceutically acceptable salt thereof, the active ingredient may be mixed with a solid, pulverulent carrier, for example lactose, saccharose, sorbitol, mannite, a starch such as potato starch, corn starch, amylopectin, laminaria powder or citrus pulp powder, a cellulose derivative or gelatine, and also may include lubricants such as magnesium or calcium stearate or a Carbowax or other polyethylene glycol wax and compressed to form tablets or centres for drages. If drages are required, the centres may be coated, for example with concentrated sugar solutions which may contain gum arabic, talc and/or titanium dioxide, or alternatively with a lacquer dissolved Illustrative means for the various groups shown in the aforesaid formula are as follows:

A: CH -CH -CH2 CH2CH2-,

-CH(CI-I )CH or Cl-I(CH )-CH(CH) R: methyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl,

n-arnyl, phenyl, o-tolyl, m-tolyl, p-tolyl, 2,4-dimethylphenyl, 2-chloro-4-methylphenyl, o-methoxyphenyl, mmethoxyphenyl, p-methoxyphenyl, o-ethoxyphenyl, m-

in easily volatile organic solvents or mixtures of organic solvents. Dyestuffs can be added to these coatings, for example, to distinguish between different contents of active substance. For the preparation of soft gelatin capsules (pearl-shaped closed capsules) consisting of gelatin and, for example, glycerin, or similar closed capsules, the active substance may be admixed with Carbowax. Hard gelatin capsules may contain granulates of the active substance with solid, pulverulent carriers such as lactose, saccharose, sorbitol, mannite, starches (for example potato starch, corn starch or amylopectin), cellulose derivatives or gelatin, and may also include magnesium stearate or stearic acid. Dosage units for rectal application may be in the form of suppositories comprising the active substance in admixture with a neutral fatty base, or gelatin rectal capsules comprising the active substance in admixture with a Carbowax or other polyethylene glycol wax.

Liquid preparations for oral application may be in the form of syrups or suspensions, for example solutions containing from about 0.1% to 20% by weight of active substance, sugar and a mixture of ethanol, water glycerine, propyleneglycol and, optionally, aroma, saccharin and/or carboxyrnethylcellulose as a dispersing agent.

For parenteral application by injection preparations may comprise an aqueous solution of a water soluble pharmaceutically acceptable salt of the active substance desirably in a concentration of -10%, and optionally also a stabilising agent and/or buffer substance in aqueous solution. Dosage units of the solution may advantageously be enclosed in ampoules.

Benzothiophene derivatives of the aforesaid Formula I may be produced according to a further aspect of the invention, by condensing a compound of the formula:

S o o-o Q It with a compound of the formula:

Y-AN

wherein A Q and Q have the same meaning as A, R and R respectively, Q represents a hydrogen, fluorine, chlorine or bromine atom or a lower alkyl or lower alkoxy group or provided Q represents a hydrogen atom, a nitro, lower acyloxy, lower dialkylamino or lower acylamino group or a hydroxy or amino group substituted by a protecting group replaceable by hydrogen by hydrolysis or hydrogenation, Q represents a lower alkyl group or a protecting group replaceable by hydrogen by hydrolysis or hydrogenation, Q represents a lower alkyl or benzyl group or NQ Q represents a pyrrolidino, piperidino, hexamethyleneimino, morpholino, tetrahydropyridino or lower dialkylmorpholino group or a piperazino, lower alkyl piperazino or benzyl piperazino group in which the nitrogen atom in the 4-position is substituted by a lower alkyl or benzyl group or by a protecting group replaceable by hydrogen or hydrolysis or hydrogenation, and X and Y represent atoms or groups reactable together to form an ether linkage between the benzothiophene moiety and the group A and, where a benzothiophene derivative which contains a hydroxyl group or a primary or secondary amino group is desired, replacing the protecting group or groups by hydrolysis or hydrogenation. Where the benzothiophene derivative is required in the form of a pharmaceutically acceptable salt the process may include the step of converting the product of the condensation step before or after removal of any protecting steps present into the desired salt. Where in the desired Cit product R represents an acyloxy or acylamino group, there may first be formed the corresponding hydroxy or amino compound which is then acylated to give the desired product. Where in the desired product R represents an amino group, there may first be produced the corresponding nitro compound which is then hydrogenated.

In the compounds of Formulae II and III X may, for example represent hydrogen, sodium, potassium, rubidium or trialkylammonium, and Y may, for example represent halogen, such as chlorine or bromine or a functionally equivalent group such as benzenesulphonyl or toluylsulphonyl.

Starting materials of the general formula:

where R, R and R have the same significance as stated above, may be prepared by several different methods, as illustrated by the following reaction schemes:

Method A -o0on COOH SH -s-o1ncon oooom on S-OH2COR S COR R2 32 Method B 0on3 RG06, OH

S /-COR R2 R2 Method C on, SH COR 3/ COR R R2 Illustrative procedures for carrying out Methods A, B andCfollow.

The thiosalicylic acids used as starting materials for the first stage of Method A were generally prepared by the standard method described for the preparation of thiosalicylic acid in Orgonic Syntheses col. vol. II, 580.

w-[2 carboxythioaryloxy]-acetophenones have been synthesised by the following procedures for carrying out the first stage of Method A:

A mixture of 15 g. of Z-mercapto-S-methylbenzoic acid, 26 g. of potassium carbonate, 22.6 g. of w-bromop-ethoxyacetophenone and 260 ml. of acetone was stirred and refluxed overnight. Water was added until a clear solution was obtained, any undissolved material being extracted with ether. The mixture was acidified and the product collected by filtration. After recrystallisation from alcohol 18.9 g. of w-[4'-methyl-2'-carboxythiophenoxy]-4 ethoxyacetophenone (M.P. 153 C.) were obtained.

The following w-[Z carboxythioaryloxy] acetophew-[Z carbomethoxythioaryloxy]-acetophenones have been synthesised by the following procedure for carrying out the second stage of Method A:

To an ice-cold solution of 5.6 g. of diazomethane in 250 ml. of ether, 29.4 g. of w-[4-methyl-2-carboxythiophenoxy] 4 ethoxyacetophenone are added in portions. After addition was completed, the mixture was allowed to warm to room temperature for 2 hours. The ether was then evaporated and the residue recrystallized from methanol. 31.2 g. of w-[4' methyl 2-carboxymethoxythiophenoxy]-4-ethoxyacetophenone (M.P. 90 C.) were obtained.

The following w-[Z carbomethoxythioaryloxy] -acetophenones have been prepared in an analogous way.

R s cH=-o o-Q R2 R0 1 R M.P., C

4-0 (CH2): H H 58 4-F H H 114: 4-01 H H 130 iv-O CH: H H 136 4-0 02115 H 108 H -CH5 H 105 4-OC2H5 6-CHa H 108 4u-O C2115 4:"CH3 5-CH3 107 4rOO2Ha 4-(31 H 102 4OC2H5 6-01 H 66 4-OC2H5 4-0 CH3 H 120 The following 2-aroyl-3-hydroxy-benzothiophenes have been prepared in an analogous way.

4 1 H H 115 4 01 H H 150 r-oorn. H 11 140 H 6-CHa H 105 r-oolm 5-011; 6-011. 177 4 00211. 5-01 H 154. 4 002115 7-01 11 134 #002115 5-OCHa H 150 3-methoxybenzothiophenes used as starting materials in Method B may be prepared from the corresponding 3- hydroxy benzothiophene by methylation with dimethylsulphate.

2-aroyl-3-hydroxy-benzothiophenes have been synthesised by the following procedure for carrying out Method B:

In a 500 ml. three-necked round bottomed flask fitted with a stirrer, a reflux condenser and a stopper, g. of 3-n1ethoxybenzothiophene and g. of p-ethoxybenzoylchloride were dissolved in 200 m1. of carbon disulphide.

30 This solution was cooled in an ice bath and 30 g. of anhydrous aluminum chloride were added in portions. After addition was complete, the mixture was refluxed for 3 hours on a water bath. The solvent was then distilled oil and the residue treated with ice and 100 ml. of 5-N hydro- 35 chloric acid. The mixture was extracted with ether, the

ether layer washed with water, dried with sodium sulphate and evaporated. After recrystallization from methyl ethyl ketone, 25.2 g. of Z-(p-ethoxybenzoyll)-3-hydroxybenzothiophene M.P. 139 C. were obtained.

The following 2-aroyl-3-hydroxy benzothiophenes have been prepared inan analogous way.

-Q S R2 EXAMPLE I A mixture of 12 g. of 2-benzoyl-3-hydroxybenzothiophene, 120 ml. of acetone, 19.5 g. of potassium carbonate and 7.5 g. of Z-dimethylaminoethylchloride hydrochloride was refluxed with stirring for 24 hours. The mixture was filtered and the acetone and volatile impurities removed by distillation under reduced pressure on a boiling water bath. The residue was dissolved in ether and the hydrochloride precipitated by the addition of a solution of hydrogen chloride in ether. The product was collected by filtration and recrystallized from ethyl acetate. In this way 4.7 g. of 2-benzoyl-3-NN dimethylaminoethoxy benzothiophene hydrochloride (M.P. 138 C.) was ob- 8 Example 2. Theproduct, Z-(p-ethoxybenzoyl)-3-pyrrolidinoethoxy-S-methylbenzothiophene hydrochloride, after several recrystallizations from acetone, had a melting point of 169 C.

tained. 5 EXAMPLE 6 EXAMPLE 2 A mixture of 12 g. of 2-benzoyl-3-hydroxybenzothio- A mixture of 8 g. of 2-(p-ethoxybenzoyl)-3-hydroxy-5- phene, 120 ml. of triethylamine and 7.5 g. of dimethylmethylbenzothiophene, 200 ml. of acetone, 10.6 g. of aminoethylchloride hydrochloride was refluxed over night. Potassium carbonate and 4.8 g. of pyrrolidinoethyl 20 g. of potassium carbonate was then added. The mixture chloride hydrochloride was refluxed for 24 hours. The 10 was filtered and the residue treated as described in Expr d ct Was isolated in the same way as described in ample 1. After several recrystallizations from ethyl ace- Example I. After recrystallization from acetone, 7.0 g. of tate, 2 benzoyl 3-NN-dimethylaminoethoxybenzothio- 2 (p-ethoxybenzoyl) 3 pyrrolidinoethoxy-S-methylphene (M.P. 138 C.) was obtained. (lzgrtigioltsdiophene hydrochloride (M.P. 169 C.) was EXAMPLE 7 EXAMPLE 3 1.0 g. of sodium hydride (50%) was dissolved in 150 ml. of dimethylsulphoxide. 12.5 g. of 2-(p-ethoxybenzod A gnxture of 11 g. of Z-(p-tert-butylbenzoyl)-3-hyl)-3-hydroxybenzothiophene and 6.5 g. of 2-pyrrolidino- Q enzothlophene 110 Of p g of P ethylchloride were added. The mixture was stirred on a tasmm carPonate and of pyrmhdmoethylchlonde 2O boiling water bath for 3 hours, cooled and filtered. The P 9 was refluxed for 24 hollm h Product was solvent was distilled off under reduced pressure and the lsolatfid the sm ne Way as descnbed Example residue dissolved in ether. The hydrochloride was precipi- After recrystalhzatlonffom acetone of tated by the addition of hydrogen chloride in ether and butylPenzoyl)'3'pyflrohdmoethoxy benzothlophene hydro the product recrystallized from acetone. 5 g. of 2-(p-ethchlonde 162 was Obtamed' 25 oxybenzoyl) 3-pyrrolidinoethoxybenzothiophene hydro- EXAMPLE 4 chloride (M.P. 137140 C.) was obtained.

In a 500 ml. flask with a stirrer and a reflux condenser EXAMPLE 8 of chloride 9 of aqetons Example 2 was repeated with the potassium carbonate and of pyrrohdlrfoethanol were mlxed' The mlxture replaced by an equivalent amount of rubidium carbonate. was refluxed for 10 mlnutes and cooled. 12.5 g. of 2-(p- In this Way 72 of 2 (p ethoxybenzoyl) 3 Pyn-o1idino ethoxybenzoyl) 3'hydmxy's'methylbenzothlophene and ethoxy-S-methyl benzothiophene hydrochloride (M.P. 16.6 g. of potassium carbonate were added and the mix- Q) was obtained ture refluxed over night. The mixture was then cooled .and filtered and the acetone solution was evaporated. The EXAMPLE 9 residue was extracted with boiling ether, the ether solu- A mixture of 12 of 24 14-h tion was evaporflted i116 fesidll? fiissolvejd in 200 phene, 120 m1. of acetone, 19.5 g. of potassium carbonate f acetone- T1115 Solutlofl Was acldlfied Wlth hydrogen and 11.5 g. of B-diethylaminoethylbromide hydrobromide chloride in acetone and filtered hot. The solution was conwas r fluxed o night Afte Working up i the manner centrated to a small volume, which on cooling deposited 40 described in Example 1, 8 6 g of 1- 2 (P' Y Y -PY Y" y ylaminoethoxybenzothiophene hydrochloride (M.P. 107 thiophene hydrochlorlde (M.P. 160 C.). (3,) were obtained,

EXAMPLE 5 EXAMPLE 10 A mixture of 9 g. of 2-(p-ethoxybenzoyl)-3-hyd1'oxy-5- Example 2 was repeated with the acetone replaced by methylbenzothl p of acetone and Q- g- Of an equal volume of dimethylformamide. 6 g. of 2(p-eth Z-pyrrohdmoethyl chloride were refluxed over night. 10 oxybenzoyl) 3 pyrrolidinoethoxy-S-methyl benz thi g. of potassium carbonate was then added and the mixphene hydrochloride (M.P. 169 C.) were obtained. ture stirred under reflux for some minutes. The product The following compounds have been prepared in an was then isolated in exactly the same way as described in analogous way:

R3 N Equivalent weight .P. A R R R k Found iigd 0.

/CH; 11 CH2-CH2 H H N\ 354 361 u on.

C1H5 12 -'CH2'CH2 H H N 388 390 112 CHz-CHz 13 CH2- 2- @o orn)3 n: H N\ 442 444 162 CHz-CHz C2H5 14 OH2-OHz- F H H N 406 408 159 02115 /CHz-CH2 15 CH2-CH2- F H H -N 407 406 177 bl/ Equivalent weight Calcu- M.P., A R R R R Found lated C.

Example Cam 1:; 0H2-CH1- O1 H H -N 420 424 187 CzHg CH -CH 17 --OH2-CH2 Same as above H H N 426 422 190 CHz'CH CHz-CH 18 CH2-CH2 -d0 H H --N CH 435 434 215 cm-cfi CHz-CHg-CHg 19 GH2-CHz- .d0 H H N 447 450 144 CH2-OH2CHz 02115 20 OH1-CH- ---OCH5 H H N 418 420 130 C2Hs GHQ-CH2 21 CHz-CHz- Same as above H H N I 414 418 177 CH lfiz CHz-CH 22 CH2'CH2 ---..do H H -N OH 430 430 190 CH -Cfi CH -CH CI-h 23 CH2-CH2 -----do H H -N 441 446 12s CHz-CHq-CH 02H 24 CH2-CH2 Q-o 02H 11 H N 430 434 150 C2Hs CHz-CH:

25 CHz-CHz- Same as above .1 H H N 432 432 140 CHz-CH2 OHz-OH:

26 -CHzCHa- -..-.do H H N CH1 440 44 130 OH -CH:

CH2-CH2 27 -OHz-OHz-- do H 1 H N O 448 4 g 5 CHa-CH2 CzHg 2s --CHz'CH2- -.-do 5-CH: H -N 452 448 137 CHz-OHg Z9 CH2-CH2 .d0 5-0113 H -N 448 446 169 CH2-CH2 CHz-O'Hz 30 CH2'CH2- do 5-011: H N CH: 465 460 157 CHz-CHz CHzCH; 31 --CH2-CH2 H 6CHa -N 401 402 1 6 OH CH CHz-CHz 32; -om-cH2- Q-o 0211,. 5-0113 6CH3 -N 411 460 104 R3 N/ Equivalent weight Caleu- M.P., A. R R R R Found lated C.

Example: I

/CHg-CH 33 CH2-CHz Same as above 5-61 H N 459 4 149 GHz-CH CHz-CH2 34 -GH2-CH2 ---.-do 7-C1 H N\ CH; 482 480 180 CHrCHg 35 OH3CH2 .-do 5-0 CH3 H N\ 469 462 93 GEM-CH2 CH2-CH 36 CH2-CH2 -d O CH3 H N O 485 478 121 CHz-CHz CHzCH2 37 -cnzoH. 0H.-.. 5-Br H N\ 483 481 m CHZ-CHB OHg-CH: 38 CH2CH2 2 5 5-131 H N\ 511 511 169 CH2-CH 39 OHzCHz-OH2 Same as above 5-131 H -N\ 529 527 136 CH CHz-CHz 40 GH2GH2 .-.-do 6-Br H N\ /0 560 555 170 CH2--OH2\ EXAMPLE 41 tablets can be marked with break lines to enable a dose An antitussive syrup containing 0.5% (weight per volume) of active substance was produced from the following ingredients:

2 (p ethoxybenzoyl) 3 (5-morpholinoethoxy)- benzothiophene 0.5 Saccharin 0.6 Sugar 3.0 Glycerin 5.0 Distilled water 10.0 Aroma 0.1

Ethanol 96% to 100.0 ml.

EXAMPLE 42 250 g. of 2-(p-ethoxybenzoyl)-3-(fl-pyrrolidinoethoxy)- .5,6-dimethylbenzothiophene were mixed with 175.80 g. of lactose and 169.70 g. of potato starch, the mixture was moistened with an alcoholic solution of g. of stearic acid and granulated through a sieve. After drying, 160 g. of potato starch, 200 g. of talc, 2.50 g. of magnesium stearate and 32 g. of colloidal silicon dioxide were mixed in and the mixture was pressed into tablets (10,000) each weighing 100 mg. and containing mg. of active substance which are suitable for use as analygesic tablets. The

other than 25 mg. or a multiple thereof to be administered. Antitussive tablets may be prepared by replacing the above active substance by 2-(p-ethoxybenzoyl)-3-(i3-pyrrolidinoethoxy) -5-methoxy-benzo thiophene.

EXAMPLE 43 A granulate was prepare from 250 g. of 2-(p-ethoxybenzoyl 3 (fi-pyrrolidinoethoxy) 5 ,6 dimethylbenzothiophene, 175.90 g. of lactose and an alcoholic solution of 10 g. of stearic acid. After drying, the granulate was mixed with 56.60 g. of colloidal silica, 165 g. of talc, 20 g. of potato starch and 2.50 g. of magnesium stearate and pressed into dragee centres 10,000). These were first coated with 6 g. of shellac, then with a concentrated syrup containing 502.28 g. of crystallized saccharose, 10 g. of gum arabic, 0.22 g. of dyestuff and 1.5 g. of titanium dioxide, and dried. Analgesic dragees weighing 120 mg. and containing 25 mg. of active substance were obtained.

When 2-(p-ethoxybenzoyl) 3 8-morpholinoethoxy)- benzothiophene was used as active substance, antitussive dragees were obtained.

EXAMPLE 44 1.0 g. of 2-(p-ethoxybenzoyl)-3-(;8-pyrrolidinoethoxy)- S-methylbenzothiophene and 0.10 g. of ascorbic acid, were dissolved in distilled water to make ml. This solution, each ml. of which corresponds to a content of 10 mg. of active substance, was used to fill ampoules which were sterilized by heating in the usual Way.

Toxicity tests and tests on analgetic, antitussive and spasmolytic effect of compounds of the invention were performed as will be described hereinafter.

I 3 Analgetic effect ED50 p.o. mk./kg. bodyweight Analgetic effect 50-100 100-200 200-400 As a comparison the analgetic eifect of codeine phosphate and d-propoxyphene hydrochloride was estimated using the same method. All compounds were given orally.

Antitussive effect The antitussive effect was investigated by estimation of the dose of the test substance which upon intravenous ininjection revoked electrically induced attacks of coughing in an anesthetized cat by the method described by Domenjoz, Arch. fiir eXper. Pathologie u. Pharmakologie 215, 19-24 (1952). The dose which gives a cough inhibiting etfect in at least 50% of the experiments (EDS-) is given. The eifect is reported in the following way:

1 4 EDSO mg./kg. bodyweight (a): Antitussive eifect a=23 3 as5 As a comparison the eifect of codein phosphate was estimated using the same method.

Spasmolytic effect The spasmolytic effect was estimated in classical way by measuring the reversion of B aCl induced spasm in the isolated small intestine of the guinea pig. A comparison with the spasmolytic eifect of papaverine and diphenhydramine-HCI was. carried out and the effect of the test substance is recorded in parts of the eifect of papa erine resp. diphenhydramineHCl.

Toxicity The substance to be tested was administered intraperitoneally or orally to 34 groups of 10 albino mice. The animals were observed for 24 hours. The number of mice which were killed by the substance at each dose Was recorded and expressed in percent: of the number of animals injected at this dose. The dose of the test substance which killed of the animals (LDSO) was estimated from a logarithmic dose response curve based on 3 to 4 doses. The results are given in Table II.

The result of the pharmacological test are indicated in Tables I and II. A, R, R R and NR R have the specified significance.

TABLE I. ANALGETIC AND ANTITUSSIVE EFFECT Anti- Analgetic tussive efiect, effect, A R R R NR R p.o. i.v.' Code number:

43/59 -CIEIzCHz O(CH H H N /CH 57/l6.--.. -o1=r2-o112- Q H H -N\ /C2HB 57/14 CHzCH2- Same as above H H N\ 57/58 CH2C 2- c cnm 11 H -N L. /C2H5 57 21 on2o11l F n H -N\ 43/49 -OHCHZ Sameasabove H H -.N

/C2H5 43 25 OH2CH2 @421 H H N\ OzHs 43/26 -CH2-CH2 Same as above.. H H N 43/28 *CHZ-{ZHTF .....-d0 H H "N /C2H5 41 99-; OHzOHz -o OH; H H -N \CZH5 43/22 -CH2-CH2. Sameasabove... H H --N 43/23 O112cH2- d0 H H -N TABLE I.- Cntinued Anti- .Analgetic tussive effect, effect, A R R R NR R p.0. i.v.

Code number:

43 24 -CHgOHz- Q-OOHa H 11 N /CgH 41/90 41112-0112- Q-o 021 5 H H --N\ 53/83 CHaCHa- Sameasabove H H N\ 41/89 ---CH2CHzdo H H -N\ 53/84 CH:-0Hz ..do H H --N 0 /C2H5 63/24 -CH2CHado 5-01-11 H -N\ 63/23 -CH2-CHzdo 5-011; H N

63/25 -CHzCHz- -.(l0 5-CH H -N 57 CHzOH2- II 0c1r3 N 67/23 -CH2G 2- --0 03H, 5-0111 e-om N 63/35 -OH2CH2- Same as above 5-0 CH3 II N 63/36 "'CH2 CH2 do 5-0 OH; H N O d-Propoxyphene. H01 Codein phosphate TABLE II. SPASMOLYTIC EFFECT AND TOXICITY Toxicity LDso mgJkg. bodyweight A R R R -NR R Spasmolytic efi'ect P.o. 1;).

Code number:

53/84 CH2CH2 Q-O 02H; H H N 0.7 x papaverine 1, 600 680 67/23 -CHz-CH2 Same as above 5-CH3 6-01-13 Same as above 500 130 d-Propoxyphene, HCL. 240 100 Codein Phosphate. 0.03 x diphenhydramine. 750 140 Papaverine-.- 0.7 diphenhydramine We claim: phenyl, and bromine substituted phenyl; R is a radical 1. A compound selected from the class consisting of the benzothiophene derivatives represented by the formula:

wherein R is a radical selected from the class consisting of alkyl of one to five carbon atoms, phenyl, phenyl substituted by alkyl having from one to four carbon atoms, phenyl substituted by alkoxy with from one to four carselected from the class consisting of hydrogen, alkyl having from one to five carbon atoms, alkoxy having from one to four carbon atoms, fluorine, chlorine and bromine; R is a radical selected from the class consisting of hydrogen, alkyl having from one to five carbon atoms, alkoxy having from one to four carbon atoms, fluorine, chlorine and bromine; -NR R is a group selected from the class consisting of dialkylamino with from one to five carbon atoms in each alkyl group, pyrrolidino, piperidino, hexamethyleneimino, morpholino, lower dialkylmorpholino, and tetrahydropyridino, and A represents an alkylene group having not more than four carbon atoms; and phar- 2. A compound according to claim 1 selected from bon atoms, fluorine substituted phenyl, chlorine substituted maceutically acceptable salts thereof.

the class consisting of the benzothiophene derivatives represented by the formula:

wherein R. R and R are as defined in claim 1, and

. NR R is a group selected from the class consisting of dialkylamino having one to five carbon atoms in each alkyl group, pyrrolidino, piperidino, morpholino and tetrahydropyridino, and pharmaceutically acceptable salts thereof.

3. A compound according to claim 1 selected from the class consisting of the benzothiophene derivatives represented by the formula:

and pharmaceutically acceptable salts thereof.

5. A compound according to claim 3 selected from the class consisting of the benzothiophene derivative of the formula:

out-0H2 and pharmaceutically acceptable salts thereof.

6. A compound according to claim 3 selected from the 10 class consisting of the benzothiophene derivative of the formula:

CHgCI-I and pharmaceutically acceptable salts thereof.

7. A compound according to claim 3 selected from the 20 class consisting of the benzothiophene derivative of the formula oHrom and pharmaceutiaclly acceptable salts thereof.

8. A compound according to claim 3 selected from the class consisting of the benzothiophene derivative of the formula:

H C- OOH2CHz- -N Y i \CZHE and pharmaceutically acceptable salts thereof.

No reference cited ALEX MAZIEL, Primary Examiner J. TOVAR, Assistant Examiner US. Cl. X.R.

3,558,616 January 26, 1971 Patent No. Dated Inventofls) Arne Elof Brandstr'om and Stig like Ingemar Carlsson It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

\ Column 2 line 64, "means" should be meanings Column 2, lines 64-71, should be at column 2, lines 1-8;

Column 3, line 48, there should be a parenthesis before "wherein" Column 3, line 66, there should be a closed parenthesis after "A' Column 13, line 12, "mk./kg. should be mg./kg.

In Table I, for Code number 57/14, insert in last column captioned "Antitussive effect, i.v.

Column 16, line 75, should precede column 16, line 74;

Column 17, line 10, "R. should be R,

Signed and sealed this 1L .th day of September 1971 (SEAL) Attest: v

EDWARD M.FI.ETCHER,JR. ROBERT TSCHALK Attesti Officer Acting Commissioner of Pat 

